19 people decided to fly planes into buildings and we invaded two countries, massively expanded and accelerated the most powerful surveillance apparatus that has ever existed, and invented a gargantuan bureaucracy that carries out tens of millions of man-hours a year of security screenings. it doens't take anarchy to shift the security calculus enough to greatly alter culture.
Sure, there might be overreaction. I'm saying we don't need to worry about criminals or terrorists using them any more than we do conventional weapons. Of course people will still worry too much if it's on the news, just like 911.